Output noise verification
Periodic and random output deviations superimpose a residual AC voltage on the DC output. This
residual voltage is specified as the rms or peak-to-peak noise in and is specified in the product data
sheet.
1.
Turn off the power supply using the AC line switch.
2.
Connect a load resistor or electronic load, differential amplifier, and an oscilloscope (AC coupled) to
the output as shown below.
3.
Use an appropriate load resistor (see load resistor value Recommended test equipment list) to keep
the power system at the instrument setting specified in the test record form under “CV Ripple and
Noise”. See the Test Record Forms under “CV Ripple and Noise” for details.
4.
As shown in the figure, use two BNC cables to connect the differential amplifier to the (+) and (−) out-
put terminals. Each cable should be terminated by a 50 Ω resistor. The shields of the two BNC cables
should be connected together. Connect the differential amplifier output to the oscilloscope with a
50 Ω termination at the oscilloscope input.
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